—Another cup of tea?—No,thanks. I_______ be off. Gina is waiting for me.A. can b. must c. may
China has a history of more than five ________ years.
The girl ________ by the lake yesterday.
– I hear Yang Yan made an English speech at the graduation ceremony yesterday.- ______, and _______.
I don’t know if hetomorrow. If he, I’ll tell him about it.
We can’t work out the physics problem. Can you tell us ____?